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The following is a compilation of American federal holidays, federal observances, state holidays and other common patriotic and national observances and commemorations that apply to the United States during Wednesday, 2018-03-14:

## Pi Day:

^{[non]}Happy Pi Day! Today is a favorite day among geeks in the United States and around the world, as March 14 commemorates one of the most fundamental and strange numbers in mathematics, pi. Pi, often written in mathematics the Greek letter "π", is the ratio of the circumference of a circle to its diameter. March 14 is Pi Day because the first few significant digits of the mathematical constant pi are 3.14. It is also Albert Einstein's birthday. Traditions on this day include:- Baking pies to celebrate Pi Day.
- Throwing pies.
- Wearing something with a π on it to honor the day (i.e. a t-shirt, a bracelet).
- Doing math exercises.
- The singing of Happy "Pi" Day Song (similar to the Happy Birthday song).

The following is the value of the constant pi(π) with up to 100 decimal digits: 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679.